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Simplifying -5 + -8(1 + 9x) = 21 -5 + (1 * -8 + 9x * -8) = 21 -5 + (-8 + -72x) = 21 Combine like terms: -5 + -8 = -13 -13 + -72x = 21 Solving -13 + -72x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + -72x = 21 + 13 Combine like terms: -13 + 13 = 0 0 + -72x = 21 + 13 -72x = 21 + 13 Combine like terms: 21 + 13 = 34 -72x = 34 Divide each side by '-72'. x = -0.4722222222 Simplifying x = -0.4722222222
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